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strings. It also prevents isInViewport from // having to look up and wrap the dom element corresponding to the viewport selector $.fn.isInViewport = function(options) { return this.filter(function (i, el) { return isInViewport(el, options); }) }; $.fn.run = run; // lets you chain any arbitrary function or an array of functions and returns a jquery object function run(args) { var this$1 = this; if (arguments.length === 1 && typeof args === 'function') { args = [args]; } if (!(args instanceof Array)) { throw new SyntaxError('isInViewport: Argument(s) passed to .do/.run should be a function or an array of functions') } args.forEach(function (arg) { if (typeof arg !== 'function') { console.warn('isInViewport: Argument(s) passed to .do/.run should be a function or an array of functions'); console.warn('isInViewport: Ignoring non-function values in array and moving on'); } else { [].slice.call(this$1).forEach(function (t) { return arg.call($(t)); }); } }); return this } // gets the width of the scrollbar function getScrollbarWidth(viewport) { // append a div that has 100% width to get true width of viewport var el = $('<div></div>').css({ width: '100%' }); viewport.append(el); // subtract true width from the viewport width which is inclusive // of scrollbar by default var scrollBarWidth = viewport.width() - el.width(); // remove our element from DOM el.remove(); return scrollBarWidth } // Returns true if DOM element `element` is in viewport function isInViewport(element, options) { var ref = element.getBoundingClientRect(); var top = ref.top; var bottom = ref.bottom; var left = ref.left; var right = ref.right; var settings = $.extend({ tolerance: 0, viewport: window }, options); var isVisibleFlag = false; var $viewport = settings.viewport.jquery ? settings.viewport : $(settings.viewport); if (!$viewport.length) { console.warn('isInViewport: The viewport selector you have provided matches no element on page.'); console.warn('isInViewport: Defaulting to viewport as window'); $viewport = $(window); } var $viewportHeight = $viewport.height(); var $viewportWidth = $viewport.width(); var typeofViewport = $viewport[0].toString(); // if the viewport is other than window recalculate the top, // bottom,left and right wrt the new viewport // the [object DOMWindow] check is for window object type in PhantomJS if ($viewport[0] !== window && typeofViewport !== '[object Window]' && typeofViewport !== '[object DOMWindow]') { // use getBoundingClientRect() instead of $.Offset() // since the original top/bottom positions are calculated relative to browser viewport and not document var viewportRect = $viewport[0].getBoundingClientRect(); // recalculate these relative to viewport top = top - viewportRect.top; bottom = bottom - viewportRect.top; left = left - viewportRect.left; right = right - viewportRect.left; // get the scrollbar width from cache or calculate it isInViewport.scrollBarWidth = isInViewport.scrollBarWidth || getScrollbarWidth($viewport); // remove the width of the scrollbar from the viewport width $viewportWidth -= isInViewport.scrollBarWidth; } // handle falsy, non-number and non-integer tolerance value // same as checking using isNaN and then setting to 0 // bitwise operators deserve some love too you know settings.tolerance = ~~Math.round(parseFloat(settings.tolerance)); if (settings.tolerance < 0) { settings.tolerance = $viewportHeight + settings.tolerance; // viewport height - tol } // the element is NOT in viewport iff it is completely out of // viewport laterally or if it is completely out of the tolerance // region. Therefore, if it is partially in view then it is considered // to be in the viewport and hence true is returned. Because we have adjusted // the left/right positions relative to the viewport, we should check the // element's right against the viewport's 0 (left side), and the element's // left against the viewport's width to see if it is outside of the viewport. if (right <= 0 || left >= $viewportWidth) { return isVisibleFlag } // if the element is bound to some tolerance isVisibleFlag = settings.tolerance ? top <= settings.tolerance && bottom >= settings.tolerance : bottom > 0 && top <= $viewportHeight; return isVisibleFlag } // get the selector args from the args string proved by Sizzle function getSelectorArgs(argsString) { if (argsString) { var args = argsString.split(','); // when user only gives viewport and no tolerance if (args.length === 1 && isNaN(args[0])) { args[1] = args[0]; args[0] = void 0; } return { tolerance: args[0] ? args[0].trim() : void 0, viewport: args[1] ? $(args[1].trim()) : void 0 } } return {} } }))); //# sourceMappingURL=isInViewport.js.map </script> <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.19.0/prism.min.js"></script> <script> $(document).ready(function() { $(document).on('scroll',function(e) { $('h2[id]').each(function() { if ( $(this).offset().top < window.pageYOffset + 100 && $(this).offset().top + $(this).height() > window.pageYOffset + 100 ) { $(this).addClass('is-active'); var data = $(this).attr('id'); window.location.hash = '#!' + data; var $location = window.location.hash.replace(/^#!/, ''); $('.js-docs-sidebar a').each(function() { if($(this).attr('href').indexOf($location) > -1) { $(this).addClass('is-active'); } else { $(this).removeClass('is-active'); } }); } }); }); $(window).scroll(function() { $('.js-inviewport-item').isInViewport({ tolerance: 0 }) .addClass('is-active'); }); var options = { classes: { clone: 'o-header__top--clone', stick: 'is-sticky', unstick: 'is-unsticky' } }; if($(window).width() >= 767) { var header = new Headhesive('.js-header', options); } $('.js-navigation-open').on('click', function(event) { event.preventDefault(); $('.js-navigation-list').addClass('is-active'); }); $('.js-navigation-close').on('click', function(event) { event.preventDefault(); $('.js-navigation-list').removeClass('is-active'); }); $('.js-header-keyvisual').addClass('is-active'); // Popup $('.js-popup').magnificPopup({ type: 'inline', preloader: false, focus: '#name', // When elemened is focused, some mobile browsers in some cases zoom in // It looks not nice, so we disable it: callbacks: { beforeOpen: function() { if($(window).width() < 700) { this.st.focus = false; } else { this.st.focus = '#name'; } } } }); // Scroll $('.js-anchor-scroll').anchorScroll({ scrollSpeed: 800, // scroll speed offsetTop: 100, // offset for fixed top bars (defaults to 0) onScroll: function () { // callback on scroll start }, scrollEnd: function () { // callback on scroll end } }); }); $('.js-docs-trigger').on('click', function(event) { event.preventDefault(); $('.js-docs-sidebar').addClass('is-active'); }); $('.js-docs-trigger-close').on('click', function(event) { event.preventDefault(); $('.js-docs-sidebar').removeClass('is-active'); }); </script> </body> </body> </html>